How can I load Audible books and public library content onto an iPod classic?
How to load audible books to my iPod classic, audible.com, public library etc.
[Re-Titled by Moderator]
iPod Classic
That would depend on the format.
If you can import them to iTunes, you can then sync them from there to the iPod.
You can sync MP3, WAV and AAC files to the iPod.
click here ➜ Intro to syncing in iTunes on PC - Apple Support